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Topic: Capacitors (Read 3541 times)

Can someone explain them to me? I know that some are polar and wont work unless placed a certain way, but what i cant figure out is how to discharge them when they are full. I know they work based on the current and that current has something to do with the "force" that the electricity has. But can someone shed some light on my understanding?

So far all i have been able to do with a capacitor is make an LED slowly fade with a 470 uF, 16V capacitor, but it stays faded and the capictor keeps the charge.

« Last Edit: March 04, 2007, 05:55:19 PM by gamefreak »

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All hail Rodney, the holy 555 timerAnd Steve said: "Let there be lead!"

A capacitor works gust like a rechargeable battery, you fill them up and then discharge then. Polarized capacitors you can only put in one way positive to positive and negative to negative, and be careful if the current reverses or you put it in backwards the capacitor could explode it has happened to me quite a few times. Unpolarized can go in either way. Are you sher that the voltage is not coming from the rest of the circuit, after the LED fades out and the battery is disconnected test the capacitor for voltage because remember the capacitor fills right up again if the power is still on.l

i used a brown black red, so 1k resistor and when i use no resistor the LED flashes once and then nothing happens.....

If i use a 100 resistor then the LED just fades too quickly....

What happens is i turn on the power after i have discharged the capacitor and the LED goes on then fades, after i turn off the power nothing happens and the capacitor stays charges, what im asking is how do i keep the LED lit when i turn it on and keep it lit for a short time after i turn it off, right now it fades into nothing and stays off and the lower the resistance the faster it fades.

Logged

All hail Rodney, the holy 555 timerAnd Steve said: "Let there be lead!"

i used a brown black red, so 1k resistor and when i use no resistor the LED flashes once and then nothing happens.....

If i use a 100 resistor then the LED just fades too quickly....

What happens is i turn on the power after i have discharged the capacitor and the LED goes on then fades, after i turn off the power nothing happens and the capacitor stays charges, what im asking is how do i keep the LED lit when i turn it on and keep it lit for a short time after i turn it off, right now it fades into nothing and stays off and the lower the resistance the faster it fades.

when you connected your power sores directly you probably fryed your LED.